code: def forward(self, inputs):
      return self._act_op(self._bn(self._conv(inputs)))
  
imports: import paddle.nn
  import paddle.nn.functional
  from paddleseg.cvlibs import manager
  from paddleseg.utils import utils
  from paddleseg.models import layers
label_desc: Use image node_id 2 for calling the ConvBNLayer obj's underlying member method code with example usage: obj.forward(inputs) and returns: self